Amplifier adapter for telephones



l sept'. 1, 1925. 1,552,032

. H. C. BRANCH I AMPLIFIER ADAPTER FOR TELEPHONES I Filed June l2 1922|IIIIIIUIIlIII lPatented Sept. l, 1925.

UNITED STATES PATENT OFFICE.-

HARRY c. BRANCH, or CLEVELAND, oHIo, AssIGNon 'rol THE TEAGLH COMPANY,or cnnvELAND, omo, A conrorta'rron or oHIo.

AMPLIFIER ADAPTER FOR TELEPHONES.

Application led June 12, 1922. Serial No. 567,769.

T0 all whom i may concern.'

Be it known that I,`HARRY C. BRANCH, a citizen 'of the United States,residing at Cleveland, in the Vcounty of Cuyahoga and State ofOhio,-have invented certain new and useful Improvements in and Relatingto Amplifier Adapters for Telephones, of which the following is aspecification, reference beingirnade therein to the accompanyingdrawing. v I

The invention relates to means for acoustically and mechanicallyconnecting the receiver of a telephone with the small end of a horn, orother sou-nd amplifier, to the tone arm of a. phonograph, for example,theinvention being especially advantageioush` in connection with thetelephone receivers""of wireless telephone sets.

The chierl objects of the invention are comprehended in the provision ofa simple, unit-ary and inexpensive coupling device by which telephonereceivers of various shapes and sizes can be` easily and effective-lyconnected acoustically vto various oms 'of phonograph tone arms or otheramplifiers.

The preferred embodiment of the invention is shown in the accompanyingdrawing, in'which Fig. 1 is a' plan view of the main parts of -aphonograph with its sound box removed and a telephone receiveracoust-ically connected to the small end of the tone arm by means of myimproved adapter. 4

Fig. 2 is an .\,11lar,f ,1fedcentral longitudinalsection of the adapter.

Figf is an enlarged end view of the adapter.y

Fig. 4 is an enlarged horizontal axial section of t-headapter as mountedin Fig. 1, with the telephone receiver and the end of the tone arm shownin elevation.

Fig. 5 is a view Similar to that in Fig. 4 with the adapter applied to adifferent form oi phonograph tone arm.

Referring vin detail to the construction illustrated and, at the outset,to the form of construction shown in Figs. 1 to 4, inclusive, 1designates the case of a. Victor phonograph, 2 the record turn table and3 the tone arm having the Ushaped small end 3*, the g phonograph soundbox and needle having been detached Jfrom the tone arm. The large end ofthe tone arm 3 is connected in the well-known manner with thephonoproved adapter 6. This adapter, which is in the nature of atubular'coupling device, is

in the formof a unitary molding of vulcan' ized soft rubber. It isformed at one end with a relatively large seetionL having an openingadapted to receive and snugly grip the peripheral bead or flange of thediaphragm end of the telephone receiver. The

vrubber of which the adapter is lmade is capable of stretchingconsiderably and the adapter is thus capable of fitting practically anyof the standard telephone `receiverssaid receivers -dii'eringsomewhat/1in diameter. The other end 6b. of the adaptez'F ris madesmaller than the end 6 and betweenfthe two ends the ada ter isformed'with an interme-v diate reduce part or neck 6. The opening` orpassage through the reduced part 6 is of-a size adapting it to receivethe small'end of the tone arm of the Victor phonograph and others, suchas the Cheney, whose tone arm ends are com arable in size to that of theVictor. The e asticity of the rubber enables it to fit and snugly holdin the part 6c tone arms differing materially in size.

4However, the ends of the tone arms of some of the widely used makes ofphonographs, such as the Columbia and the Edison, are very much largerin diameter than the ends of the tone larm of the Victor phonograph.Accordingly I form the adapter 6 with the end 6" having its passage oropenin of a diameter adapted to receive and snug y grip the ends of thetone arms of such p onogra hs as the Columbia and the Edison. In 5 Ishow the adapter applied to a telephone receiver and the end of the tonearm 7 of a. Columbia phono* rap 't It will be seen that the adaptercomprises a'` relatively large section 6 designed to hold the telephonereceiver and a smaller section made up of the end 6" and intermediateneck 4fier to which the adapter is attached.

The method of applying and using the adapter will readily be understood.The telephone receiver is easily forced into the larger end of theadapter and the latter can then bereadily applied to the small end of ithe phonograph tone arm or other amplier.

T e res isa highly effective acoustic and mechanical coupling of thetelephone receiver to the amplifier so that the soundsA emitted from thedisc of the diaphra of the receiver are effectivelyy ampliliedmand thereceiver is firmly supported by the adapter in any desired position. Asthe adapter has no metal parts there is no possibility in its use ofmetallic vibrations or chatter.

By reason of the elasticity of the material of which the adapter is madeit is practically universal in its adaptability to iit the diil'erentstandard telephone `receivers and the various popular makes ofphonographs .and

various sizes and forms of amplifier horns. Obviously, the adapter isexceedingly simple and capable of being produced at a relatively smallcost.

While the form of the adapter shown in the drawings is that Which I havefound most satisfactory, where the adapter is intended for use only withtubular members orphonograph toney arms such as that of the Victorphonograph, it is obvious that the end section 6* of the. adapter issuperiuous and can be omitted. It will also be obvious that the formofthe adapter can be varied in other respects Without departing from theinvention, the scope of the invention being indicated by the appendedclaims. .l

What I claim is:

1. A device ofthe character described comprising a molded soft rubbertubular coupling formed at one end with a large section adapted toembrace and snugly grip the peripheral flange of the diaphragm end of atelephone receiver and also formed Witlv a smaller section having itspassage adapted to receive and snugly grip the end of a tubo: larmember, the Walls of said coupling being thick enough to sustain theWeight of the telephone receiver and firmly hold said re- 6.0 ceiver inany desired position. y

2. A device of the character described comprising a molded soft rubbertubular coupling formed at one'end with an opening adapted to embraceand snugly grip the peripheral Harige of the diaphram end of a stelephonereceiver and with the remainder of its passage having aplurality of different diameters adapted to receive and snugly grip theends of tubular members of dilerent sizes, the Walls of said couplingbeing thick enough to sustain the Weight of the telephone receiver andfirmly .'nold said receiver in. l any desired position.

3. A device of the character described i5 comprising a molded softrubber tubular coupling formed with one end larger ,than the other andwith a reduced intermediate part, the coupling at its larger end beingadapted to receive and snugly grip the'pe- E@ ripheral flange of thediaphragm end of a telephone receiver and at its smaller end and thereduced intermediate part being adapd y alternately to receive andsnugly gripthe ends of tubular members of different sizes, 55 the wallsogf said coupling being thick enough to sustain theweight of thetelephone receiver and firmly hold said receiver in any' desiredposition.

n testimony whereof7 l hereunix) am; guy 90 signature.

` HARRY C. BRANCH.

